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17.I have no idea________ they will pass the final exam.(  )
A.thatB.whenC.whetherD.why

分析 我不知道他们是否会通过期末考试.

解答 答案C.
分析句子结构可知,"________ they will pass the final exam"为同位语从句,对名词"idea"的内容进行解释说明."that"在同位语从句中没有任何的意思,故排除;BC两项与句意不符,故排除;根据"I have no idea"可知,我不知道他们能否通过期末考试,因此应该用连接词"whether   是否"来引导同位语从句,同位语从句中不能用"if"来引导,故选C.

点评 本题考查同位语从句.同位语从句是意义完整地陈述句时,用连词that引导,that在从句中不充当任何成分,只起连接词作用,通常不省略;引导定语从句的that在句中充当一定的成分,并且作宾语时可以省略.

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